hard brake pedal after HCI

Swap a different motor in to my car last week. Now the brake pedal is hard after the first time I hit them. Is this normal? I didn't have this problem with the 347 last year.

New set up is stock bottem end with TFS 1 cam ,1.6RR, tri state al heads 170cc intake runners, and pro products intake.

Got the car in the shop this morning. At idle it only has 4inch's vac. and 13inch's at 1500rpm. I double checked all the vac. line. Car only has power brakes, one for fuel pressure regulator, heater controls and pcv. I sprayed starting fluid at all the intake gaskets nothing changed. Idles at about 800rpm.

This motor had a holley systemax on it before and didn't have this problem. I'm going to check it out a little more after work.